/Engine/Source/Editor/UMGEditor/Public/DesignerExtension.h
The Designer extension allows developers to provide additional widgets and custom painting to the designer surface for specific widgets. Allowing for a more customized and specific editors for the different widgets.
class FDesignerExtension : public [TSharedFromThis< FDesignerExtension >](API\Runtime\Core\Templates\TSharedFromThis)
TWeakObjectPtr<...
Blueprint
IUMGDesigner&#...
Designer
FName
ExtensionId
TArray<FWidget...
SelectionCache